<html>
<head>
    <meta charset="UTF-8">
    <title>登录</title>
    <style>
        .div{
            margin: 120px auto;
            background-color: lavender;
            width: 350px;
            height: 150px;
            border: 5px solid gray;
        }
        body{
            text-align: center;

        }
    </style>
</head>
<style>
</style>
<body >
<div class="div">
    <form action="" method="post">
        <br>
        用户名 <input type="text" name="username"><br><br>
        密&nbsp;&nbsp;&nbsp;码 <input type="password" ><br><br>
        <input type="submit" value="提交">
    </form>

</div>
</body>
</html>